import numpy as np
arr1d= np.array([1,2,3])
print(arr1d)

arr2d=np.array([[21,2,3],[21,2,3]])
print(arr2d)

arr3d=np.array([[[3,1,2,3],[3,1,2,3]],[[3,2,2,3],[3,2,2,3]]])
print(arr3d)